<!DOCTYPE html>
<html>

<head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <style>
    .login-header {
      width: 100%;
      text-align: center;
      height: 30px;
      font-size: 24px;
      line-height: 30px;
    }

    ul,
    li,
    ol,
    dl,
    dt,
    dd,
    div,
    p,
    span,
    h1,
    h2,
    h3,
    h4,
    h5,
    h6,
    a {
      padding: 0px;
      margin: 0px;
    }

    .login {
      display: none;
      width: 512px;
      height: 280px;
      position: fixed;
      border: #ebebeb solid 1px;
      left: 50%;
      top: 50%;
      background: #ffffff;
      box-shadow: 0px 0px 20px #ddd;
      z-index: 9999;
      transform: translate(-50%, -50%);
    }

    .login-title {
      width: 100%;
      margin: 10px 0px 0px 0px;
      text-align: center;
      line-height: 40px;
      height: 40px;
      font-size: 18px;
      position: relative;
      cursor: move;
    }

    .login-input-content {
      margin-top: 20px;
    }

    .login-button {
      width: 50%;
      margin: 30px auto 0px auto;
      line-height: 40px;
      font-size: 14px;
      border: #ebebeb 1px solid;
      text-align: center;
    }

    .login-bg {
      display: none;
      width: 100%;
      height: 100%;
      position: fixed;
      top: 0px;
      left: 0px;
      background: rgba(0, 0, 0, .3);
    }

    a {
      text-decoration: none;
      color: #000000;
    }

    .login-button a {
      display: block;
    }

    .login-input input.list-input {
      float: left;
      line-height: 35px;
      height: 35px;
      width: 350px;
      border: #ebebeb 1px solid;
      text-indent: 5px;
    }

    .login-input {
      overflow: hidden;
      margin: 0px 0px 20px 0px;
    }

    .login-input label {
      float: left;
      width: 90px;
      padding-right: 10px;
      text-align: right;
      line-height: 35px;
      height: 35px;
      font-size: 14px;
    }

    .login-title span {
      position: absolute;
      font-size: 12px;
      right: -20px;
      top: -30px;
      background: #ffffff;
      border: #ebebeb solid 1px;
      width: 40px;
      height: 40px;
      border-radius: 20px;
    }
  </style>
</head>

<body>
  <div class="login-header"><a id="link" href="javascript:;">点击，弹出登录框</a></div>
  <div id="login" class="login">
    <div id="title" class="login-title">登录会员
      <span><a id="closeBtn" href="javascript:void(0);" class="close-login">关闭</a></span>
    </div>
    <div class="login-input-content">
      <div class="login-input">
        <label>用户名：</label>
        <input type="text" placeholder="请输入用户名" name="info[username]" id="username" class="list-input">
      </div>
      <div class="login-input">
        <label>登录密码：</label>
        <input type="password" placeholder="请输入登录密码" name="info[password]" id="password" class="list-input">
      </div>
    </div>
    <div id="loginBtn" class="login-button"><a href="javascript:void(0);" id="login-button-submit">登录会员</a></div>
  </div>
  <!-- 遮盖层 -->
  <div id="bg" class="login-bg"></div>
  <script>
    // 1. 获取元素
    var login = document.querySelector('.login');
    var mask = document.querySelector('.login-bg');
    var link = document.querySelector('#link');
    var closeBtn = document.querySelector('#closeBtn');
    var title = document.querySelector('#title');
    // 2. 点击弹出层这个链接 link  让mask 和login 显示出来

    link.addEventListener('click', function () {
      mask.style.display = 'block'
      login.style.display = 'block'
    })

    closeBtn.addEventListener('click', function (e) {
      e.stopPropagation()
      mask.style.display = 'none'
      login.style.display = 'none'
      login.style.left = '50%'
      login.style.top = '50%'
    })

    function Move(e) {
      let position = login.getBoundingClientRect()
      let boxX = position.left
      let boxY = position.top
      let x = e.pageX - boxX - 256
      let y = e.pageY - boxY
      // console.log(x)
      // console.log(y)
      login.style.left = e.pageX + 'px'
      login.style.top = e.pageY + 120 + 'px'
      console.log(y)
      console.log(e.pageY)
    }

    title.addEventListener('mousedown', function () {
      login.addEventListener('mousemove', Move)
    })
    document.addEventListener('mouseup', function () {
      login.removeEventListener('mousemove', Move)
      console.log(1)
    })

  </script>
</body>

</html>